Table 1.

Characteristics of epidemiological clusters, the Netherlands, 1 October 2019–31 March 2020 (n = 46 cases)

Epidemiological cluster	Cases	Province of symptom onset	Description of setting	Place of infection of source or co-primary case (if abroad)
2019-7	12	South Holland, North Holland	Party, secondary school
2019-8	4	South Holland, Gelderland	Football match
2019-9	2	South Holland	Secondary school
2019-10	3	South Holland	Hotel, family
2019-11	2	South Holland	School
2019-12	2	South Holland	Family
2020-1	2	North Holland	Friends	Western Europe
2020-2	4	Groningen	Swimming club, family
2020-3	2	Zeeland	Partners	Western Europe
2020-4	2	Groningen	Holiday abroad	Central Europe
2020-5	2	North Holland, Utrecht	Winter sport trip abroad	Western Europe
2020-6	3	North Holland	Family
2020-7	3	North Holland	Partners and friend	North America
2020-8	3	Gelderland	Family